julius j



(No Model.)

"J. J. WOLF. EA'RPHONE FOR TELEPHQNES.

No. 423,299 Patented Mar. 11, 1890.

,1 gin Dante's mum W lg.

l v vbmaooeo N. PETEH5. Phulo Lilhognphen wamn lnn, it c.

UNITED STATES PATENT OFFICE.

.JULIUS J. WOLF, OF KANSAS CITY, MISSOURI, ASSIGNOR OF TWO-THIRDS TO MAX WEIL AND AARON M. SLOSS, BOTH OF SAME PLAOE.

EAR-PHONE FOR TELEPHONE S.

SPECIFICATION forming part of Letters Patent No. 423,299, dated March 11, 1890.

Application filed January 24, 1890. Serial No. 337,951. (No model.)

Toall whom it may concern:

Be it known that I, JULIUS J. WOLF, of Kansas City, Jackson county, Missouri, have invented certain new and useful Improvements in Ear-Phones for Telephones, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention relates to improvements in ear-phones, its object being to provide a device which will increase the distance between the drum of the ear and the ear-phone nowin common use by applying my device, thereby making articulation more distinct and decreasing the noise due to induction which heretofore has been heard over the wires. I

flange B, provided with a cross-partition D,

said flange and partition forming a drumD', over which is placed a cloth or other fabric E, prepared by a chemical process. The said interior flange has a groove or thread d, by which it may be secured to the phone.

F is a central perforation through said crosspartition of the drum D, by which the sound is conducted to the ear. I

G is a phone such as are now in common use, on which my device is designed to be secured, said phone having the binding-posts g, which are connected to the transmittingwires. The accordion-plaiting O is for the purpose of increasing and decreasing the dis tance between the ear and the phone, the coilspring 0, which takes the form of aspiral, being sufficient to hold the plaiting O in position, as illustrated in Fig. 1. Should the operator wish to bring the phone nearer to the ear, by a slight pressure of the phone G the spring 0 can be closed partly or entirely, as illustrated by dotted lines in Fig. 1.

While the body B and drum D and the aocordion-plaiting G lull the noise due to induction and cross-talking, they serve tO sharpen the articulation, and when using this device one can hear very much clearer than hereto- 5 5 fore.

It has frequently been found by those talkin g through a telephone that the noise due to induction and the effect of the wind on the wires make it hard to hear articulation. Now by using my improved ear-phone this is entirely obviated, and, as before stated, articu lation is made much plainer, the space between the ear and the phone lulling the noise due to induction without affecting the speech. 05 The body B and drum D may be constructed of any suitable material, such as celluloid, gutta-percha, stiif pasteboard, or any other material which may be deemed advisable.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. An ear-phone having the main drum B, provided with an interior drum D, covered by a chemically prepared cloth E, for the purposes substantially as specified.

2. An ear-phone provided with body B, to which is secured a spiral spring a, and the accordion-plaiting O, secured over the spring, for increasing and decreasing the distance between the ear and the phone, substantially as described.

3. An can-phone having the body B and an interior drum D, covered by a cloth E and provided with a perforation F, said interior drum D being provided with a groove or channel (Z, which fits over the flange end of the phone G, for the purpose substantially as specified.

4.. An ear-phone having the body B and interior drum D, provided with a chemicallyprepared cloth E, said bodyB being provided with accordion-plaiting O, secured around spi-' ral spring 0, by which the distance between the ear and phone maybe regulated, substantially as and for the purposes set forth. I

In testimony whereof I affix my signature in presence of two witnesses.

JULIUS J. WOLF.

Witnesses:

P. O. J OHNSON, A. A. HIGDON. 

